Vent head



Patented Dec. 22, 1936 means FHQ VENT HEAD Application March 25, 1935,Serial No. 12,955

2 Claims.

My invention relates to the heads, often referred to as cowls, providedat the outlet ends of vent conduits, such as for example ventilatorpipes and smoke stacks, to cause suction to be exerted in the conduitunder the action of wind blowing against the head or the movement of thehead through the air, the heads where applied to stationary conduitscommonly being rotatable thereon to head into the wind regardless of itsdirection.

My primary object is to provide improvements in vent heads to the end ofincreasing the suction action exerted in the conduit with which it isassociated, in the relative movement of the head and the surroundingair, whether the head is stationary or is carried by a moving object.

Referring to the accompanying drawing:

Figure 1 is a plan view of a vent head shown of a constructionparticularly suited for use at the outlet of a ventilating conduit, andembodylng my invention.

Figure 2 is a side view of the structure of Fig. 1.

Figure 3 is a front view of the structure of Figs. 1 and 2 showing it asmounted on the upper end of a ventilaton conduit.

Figure l is a central vertical section taken through the structure atthe line 4 on Fig. 1; and

Figure 5, a fragmentary plan sectional view of a modification of theVent head of the preceding figures.

As a preface to the following detailed description of the constructionsillustrated it may be said that the invention contemplates the formingof the vent head of such shape as to present streamlined sides of suchcontour as to substantially coincide with the natural streamlining ofthe air in the movement of the vent-head through the air or the air pastthe head, and providing openings in these negative-pressure areastreamline sides preferably substantially throughout their length andpreferably louvered, at which suction is produced in the relativemovement of the head and the air.

Referring to the particular construction shown in Figs. 1-4, inclusive,the vent head is represented at 6 and is shown as of a constructionparticularly suited for use as the outlet of a ventilating conduit shownat l and on which the head it is rotatably mounted.

The head 5 is formed of a bottom wall, or deck, 8 apertured at 9 forregistration with the upper, open, end of the ventilating conduit 1,

wall structure ll between the decks 8 and I0.

The side Wall structure H is so shaped as shown, as to form, with theforward portions of the decks ii and ill, a hollow vent head portion l2with its forward portion of blunt, generally cylindrical, form, shownas, but not necessarily, slightly deformed to present an apex portionIt. From the ends of the wall of the hollow portion E2 the side wallstructure ll continues rearward- 1y at opposite sides of the head and ascontinuations of the general cylindrical wall referred to, formingfairings M which converge toward the rear end of the vent head and areof such contour as to substantially conform with the naturalstreamlining of the air in the relative movement of the head and theair.

The shapes of the decks 8 and iii and the surrounding wall structure llare substantially the same in plan, both decks extending rearwardly tothe end of the surrounding wall structure.

The head 6 is shown as provided with a frame l5 surrounding the opening9 in the lower deck 8 and having a circular opening It at which itextends over the top of the conduit l about which the entire head isrotatable to permit it to head into the wind at all times.

The rotatable support for the head comprises a vertical post llsupported centrally in the opening 9 by cross-members la in the conduit'5, the post extending upwardly into the head 6 and through a guidebracket l9 depending from the deck ill. A sleeve 20 encircling the upperend of the post H and extending above the upper end of the latter andresting on the bracket l9, forms a socket 2! for a ball-bearing 22 uponwhich the entire head 6 is rotatably supported.

The negative pressure areas along the side wall 5 l of the vent head arelocated wholly within the confines of the fairings it and in accordancewith my invention, as above stated, I provide in the fairings throughoutthese negative pressure areas openings through which this negativepressure may be effective to exert suction in the head 6 and in turn inthe ventilator conduit.

The openings referred to are represented at 23 and each extends at anangle to the horizontal, being shown as extending substantiallyvertically, these openings in each fairing being shown as provided in aseries extending from substantially the junctures of the fairings withthe ends of the walls of the hollow part l2, to substantially the rearend of the head 6.

The openings are preferably closely spaced and. relatively narrow asshown, and to augment the suction action for venting the conduit, areprovided with louvers 2 5 which extend outwardly from the fairings l4and toward the rear of the vent-head as shown.

As will be understood from the foregoing the streamlining of thevent-head results in the creation of the maximum areas of negativepressure, distributed along the sides of the head, available for thecreating of suction action in the head through the openings 23 in itssides, and consequently increased suction as compared with structures ofnon-streamlined form.

The addition of louvers to the openings 23 increases the effectivesuction in the head. Instead of providing the louvers 24 as shown inFigs. 1-4 they may be provided on the inside of the head at the rearedges of the openings 23 and extend inwardly and forwardly asrepresented of those shown at 25, louvers thus provided having beenshown, by experiment, to be more effective than when provided as shownin Figs. 1-4.

While I have illustrated and described certain forms of structureconstituting embodiments of my invention I do not wish to be understoodas intending to limit it thereto as the invention may be embodied inother forms of structure and those shown variously modified and alteredwithout departing from the spirit of my inven-- tion.

What I claim as new, and desire to secure by Letters Patent, is:

1. A vent head having an opening at its bottom, a vertical plane of thegreatest length of the head intersecting a vertical plane of thegreatest width thereof producing a line of intersection substantiallycoincident with the longitudinal axis of said opening, the head taperingrearwardly, its rear portion being longer than its forward portion theside walls of the rearwardly extending portion of the head havinglouvers presenting openings therebetween elongated at angles to thehorizontal the forwardly extending side walls of the head beingimperforate.

2. A vent head having an opening at its bottom, a vertical plane of thegreatest length of the head intersecting a vertical plane of thegreatest width thereof producing a line of intersection substantiallycoincident with the longitudinal axis of said opening, the head taperingrearwardly, its rear portion being longer than its forward portion, theside walls of the rearwardly extending portion of the head havingopenings therein, and the forwardly extending side walls of the headbeing imperforate.

ROBERT G. FERRIS.

